[cxxmodules] Complain if glibc is not installed.
[cxxmodules] Complain if glibc is not installed.

Likely will improve root-project/root#8157

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root